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    <!-- 1.display:block  display:table display:list-item 都具有BFC的潜质 -->
    <!-- 触发bfc的条件：
      1.float 不为none
      2.positon 为absolute或者fixed
      3.dipaly 为 inline-block table-cell  table-caption flex inline-flex
      4. overflow 不为 visiable -->
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